Brake beam support chair



Jan. 12, 1937. E, uss

BRAKE BEAM SUPPORT CHAIR Filed Dec. 24, 1934 3 Sheets-Sheet ll/vvs/vroie 010/1 50556 j Q fir OPNEY Jan. 12, 1937. E. G. BUSSE BRAKEBEAM SUPPORT CHAIR Filed Dec. 24, 1934 I 3 Sheets-Sheet 2 IN vex/7'02Zia W? 5055a E. G. BUSSE BRAKE BEAM SUPPORT CHAIR Jan. 12, 1937.

Filed Dec; 24, 1934 3 Sheets-Shet 3 j/vvg/vroz f/W/h g uss Patented Jan.12, 1937 UNITE. STATES PATENT OFFICE BRAKE BEAM SUPPORT CHAIRcorporation of Illinois Application December 24, 1934, Serial No.758,986

16 Claims.

. This invention relates to guards, guides, or supports for railwaybrake beams and consists particularly in novel chair structure forproviding a sliding bearing between the beam and an underlying guard,guide, or support strap.

Where a brake beam is equipped with an underlying auxiliary third orfourth point guard, guide, or support, a separately formed bearing onthe beam, called a chair or shoe, is usually 1o provided to slidablyengage a strap carried beneath the beam by the truck spring plank orother convenient part. Fourth point support chairs, in particular,should be adjustable angularly and laterally. relative to the beam dueto variations in the shape, height, and position of the support strap,height of the beam, etc. A simple bearing element or chair havingpivoted or flexing jaws for gripping the tension member of the brakebeam is usually provided so as to 20 facilitate the necessaryadjustment.

It has been found that this simple type of fourth point support chairtends to rotate on or slide along the tension member in spite of theclamping elements, thus working off from the support strap so as tobecome inoperative. Special hand wrenches and power tools have provenunavailing for properly seating the chair clamp and where the chair isimproperly tightened, as is frequently the case, this disadvantage isaggravated. Warpage in cast or forged chairs, which it is almostimpossible to prevent, also hastens the loosening of the chair so as torender the same ineffectual. Special tapered clamping pins and boltshave failed to overcome the above diificulty as have inserts of hardenedsteel and serrated structure applied to the clamp jaws for biting intothe metal of the tension member. Fourth point support chairs attached toboth the tension and compression members of the 40v beam will remainrigid therewith, but such a chair cannot be adjusted and for this reasonis not particularly desirable. Deformed and angular tension members areundesirable for the same reason. 45, In case of third point supports, achair, similar to the simple form of fourth point chair referred toabove, is clamped to a round pin immovably seated in special lugs orears projecting from, the front end of the strut. This chair also tendsto rotate on the ear pin due to constant vibration. In a copendingapplication Serial No. 755,686, filed December 3, 1934 in the names ofEdwin G. Busse and Herbert W. Ekholm, is illustrated a universal form ofthird point support chair which may be securely and rigidly fastened toa truss type beam without a special strut, but this chair is somewhatmore complicated than the simple clamp type chair.

One object of the present invention is to provide a brake beam supportchair which can be 5 easily applied to brake beams so as to retain itsproper adjustment indefinitely.

Another object is to provide a brake beam support chair which can berigidly and permanently clamped to the beam, but which may befreelyadjusted as required.

Another object is to provide a novel adjustable brake beam support chairwhich will retain its proper adjustment and position on the beam eventhough improperly tightened. 15

These objects and other more detailed objects are attained substantiallyby applying between the third or fourth point support chair jaws and thepart of the brake beam clamped therebetween, a frictional insert formedof material, such as rubber, having a substantially higher coefficientof friction with the metal of the beam part than the metal clampingjaws, as opposed to structure depending for its gripping power upon hardor sharp elements which penetrate the surface of the tension member.

In the accompanying drawings illustrating the invention Figure l is atopview of a part of a railway truck spring plank and truss type brakebeam.

Figures 2, 6, 9, 11, 12, 13, 14, 15, and 1'? are vertical sectionsthrough brake beam third and fourth point support chairs illustratingvarious forms of the invention.

Figure 3 is a transverse section taken on the line 3-3 of Figure 2.

Figures 4 and 51 are views corresponding to Figure 3 but illustratingmodifications.

Figure 7 is a horizontal section taken on the line l--! of Figure 6. 40

Figure 8 is a detail view of a modified form of frictional insert.

Figure 10 is a side view of a portion of the beam tension member inFigure 9.

Figure 16 is a sectional view of another form of frictional insert.

Figure 18 is a detail view of one of the inserts in Figure 17.

Figure 19 is a top view illustrating a third point support chairembodying the invention, the brake beam being illustrated in dot anddash lines.

Figure 20 is a side view, sectioned in part, of the chair in Figure 19.

Figure 21 is a vertical section illustrating another form of third pointsupport chair and is taken on the line 2l-2l of Figure 22.

Figure 22 is a top view of the third point support chair in Figure 21.

Figures 23 and 24 are partial views, partly sectioned, of brake beamsupport chairs embodying still other forms of the invention.

Figures is a sectional view taken on the line 25-25 of Figure 24.

Figure 1 illustrates a brake beam including the compression member I,strut 2 having a slot 3 and pinholes 4 for the usual brake lever (notshown), and tension member 5-of cylindrical or round section. Attachedto the spring plank 6 by means of the brackets l'are the I fourth pointguard, guide, or support straps B extending beneath the brake beambetween the strut 2 and the brake heads (not shown) at each end thereof.Clamped to the tension member 5 by means of clamping bolts 9a are thefourth point support chairs or shoes 9 which slidably engage the straps8.

The fourth point support chair, shown detailed in Figure 2, includes theenlarged bearing portion ll] for engaging the underlying supportstrapand the pivoted arcuate jaws H and I2 pinned together at l3. At theupper extremities of the jaws II and 12 are the apertures l4 and I5 forreceiving a bolt (see 'Fig. 1) for clamping the jaws II and I 2 aboutthe beam tension member 5. The inner surfaces of the jaws II and 12 arerecessed and provided with the inserts l1 and [8, preferably of liverubber, for engaging the tension member to assist in maintaining thechair rigidly assembled therewith.

The jaw recesses are preferably undercut, as; at. 19 (Fig. 3), and therubber inserts made of tapering form, as the insert l8, so as to be selfsecured therein. The inserts are compressed in application to the jawrecesses. The inserts I1 and 18 may be specially molded or formed offlat strip material, and preferably will be distorted longitudinally andlaterally and also flexed in insertion into the jawrecesses so as to besecurely held therein.

Figure 4 illustrates another manner attaching the inserts to the supportchair jaws. In Figure 4 the insert 29 is attached within the recess 2|in the jaw 22 by means of a rivet 23. The-recess 2| is substantiallylarger than the insert 29 so as to permit expansion of the insert underpressure. I

In Figure 5, the insert 24 is attached to the chair jaw 25 by a glue orcement substance 26.

Figures 6 and '7 illustrate another type of frictional insert applied tothe pivoted jaws 21 and 2B of a support chair. The pivoted jaws haveinterengaging lugs 29 and 30 receiving the pin 31. The inserts 32 and 33have interengaging' apertured lugs 34 and 35 through which the pin 3|also extends for securing the inserts 32 and 33 within the recesses 36and 31 in the chair jaws. The inserts 32 and 33 are provided with thesuction cups or recesses 32a .and 33a for increasing the frictionalresistance between chair jaws and the clamped beam member. If desired,the inserts 32 and 33 may be form'ed'integrally' as the jaws 38 and 39in Figure 8, having 'an apertured lug 40 for receiving the pivot pin tosecure the insert in position. Jaw recesses 36 and 31 provide forexpansion of the inserts 32 and 33, as in Figures 3, 4, and 5.

In Figure 9, the beam tension member 4| is. recessed at 42 and providedwith a. frictional insert 43, preferably of rubber, which is disposed tobe engaged by one of the pivoted jaws 44 of the fourth point supportchair generally indicated at 45. The chair in this form of the inventionwill be as rigidly secured in position as the chairs in the previousforms, but cannot be adjusted longitudinally of the tension memberunless the insert 43 is made of substantial length.

In Figure 11, one of the pivoted jaws 46 of the fourth point supportchair has a restricted undercut recess 41 within which is applied thefrictional insert 48 which is distorted in application thereto so as tobe self maintained within the recess. The other jaw 49 is deformed, asat 49a, and provided with an undercut recess 50 within which is appliedthe bulbous nubbin portion 51 of the frictional insert 52. The nubbin 5isecures the insert within the jaw recess.

In Figures 12, 13, 14, and 15, the fourth point chair is formed as aunitary metal member having flexible jaws. In Figure 12, the jawportions 53 flex about the narrow neck 54 connecting the same with thebearing portion 55 of the chair. Frictional insert 56, also formed inone piece, has a bulbous nubbin 51 applied to the undercut recess 58 inthe lower part of the shoe. In Figure 13, the insert 59 is formed of astrip of rubber and is crimped at 60 to form a bulbuous projection forapplication to the undercut recess 61 in the lower part of the chair 62.In Figure 14, the insert 63 has a lug 64 provided with an aperture 65 bymeans of which the insert may be pinned within the recess 56 in thelower part of the support chair 61. In Figure 15, each jaw 68 isprovided with a rubber insert 69 with a portion compressed within theundercut recess m of the jaw and another portion terminating in therecess H in the lower part of the chair. The inserts are secured to thechair jaws by rivets i2. In each of Figures 12, 13, and 14, the

rubber inserts are self secured to the chair, but these may beadditionally cemented or riveted thereto if desired.

Figure 16 shows another frictional insert 13 formed as a portion of acircle and having suction cups 14, as in Figure 6. The insert iscemented or riveted to the chair jaws.

In Figures 17 and 18, the jaws 15 have bosses 16 with apertures 71enlarged at their outer ends for receiving the button-like head portions18 of the projections E9 on the inserts 8B and 86a.

This type of insert may be easily snapped into position in the jawrecesses. The recess 15a in the right hand jaw is larger than the insert88a received therein, as in Figures 4 and 5, to permil; expansion of theinsert under pressure. The insert 8411. also has suction cups 8%, as inFigures 6 and 16. Preferably the inserts in both jaws will be identicalin practice.

Figures. 19 and 20 show in broken lines the front extremity of a brakebeam strut 8! having ears or lugs 82 projecting forwardly of the tensionmember 83. Clamped to the pin 84 ex-' third point support chair as'moreclearly illustrated and described in the above-mentioned copendingapplication Serial No. #155,686, fi led December 3,: 1934. Thechairincludes a broad bearing portion 89 for engaging the guard, guide, orsupport strap 90 and rigid jaws 9i and 91. for receiving the beamtensionmember 93 therebetween and apertured for receiving the extremities ofU-bolt 94 secured therein by the nuts 95 and for clamping about the beamstrut 96. Applied to a suitable undercut recess 91 in the inner surfaceof each pair of jaws is a rubber insert 98 for frictionally engaging thetension member 93 and having a projection 99 with an enlargement I to beinserted through the aperture I0'I for securing the insert in position.

In each of Figures 23, 24, and 25 one jaw only is shown of a supportchair similar to that in Figure 2. The jaw I02 in Figure 23 has acylindrical pocket I03 receiving the coiled spring I04 and the boss I05on the insert I06. Insert I06 engages shoulders I01 on the chair jaw tomaintain the assembly with spring I04 under compression.

In Figures 24 and 25, the jaw I08 has a laterally elongated pocket I09receiving the flexed strip spring IIO which bears against and is securedto the insert III. As in Figure 23, the insert is disposed to yieldinglyengage the gripped beam part so as to maintain the beam and chairtightly assembled in case of loosening of the clamping bolt or bendingof the chair jaws due to vibration and constant pressure. Also theyielding or resilient spring pressed inserts facilitate attachment ofthe chair to a beam part which is too small for the chair jaws. Theresiliently mounted inserts are preferably of frictional material as inthe previous forms.

The novel pliable or resilient inserts will hold the chairs rigidly inpositiori even though the clamp is not fully tightened. The inserts donot deteriorate rapidly, as might be supposed, the applicant havingsuccessfully utilized live rubber at least fifteen years old for thispurpose. But even though the inserts should dederiorate or be lost orremoved, the metal jaws would still function as satisfactorily as theold type chairs.

The novel chair has another advantage in that in case the clamping boltbecomes very loose, the inserts will prevent or reduce rattling.

Live rubber inserts are preferable due to the high coefiicient offriction between rubber and metal, but other substances might be used,such as various rubber compositions, which also have higher coefficientsof friction with the metal of the beam tension rod than the metal jawsof the chair clamp. The inserts as shown may be formed of molded orstrip material. The invention may also be applied to chairs forapplication to beam parts of non-cylindrical shape for resistinglongitudinal slippage of the chair.

The invention is not limited to the details of the various formsillustrated and described and the exclusive use of all modificationsthat come within the scope of the appended claims is contemplated.

I claim:

1. A brake beam support chair including interconnecting parts forclamping a brake beam member between them, each of said parts having arecess, and a yielding element in each recess for engaging thebeam'member to assist in maintaining the chair and beam properlyassembled.

2. Incombination, ;a brake beam member, support chair jaws clamped tosaid beam member, and frictional inserts compressed between said memberand each of said jaws for maintaining the same properly assembled.

3. In combination, a brake beam including a cylindrical portion, asupport chair having jaw portions for clamping around said beam portion,and readily compressible inserts substantially lining said jaw portionsfor engaging said beam portion to assist in maintaining said chair andbeam properly assembled, said cooperating portions of the chair and beampermitting manual angular adjustment of said chair.

4. A brake beam support chair including parts for enclosing a brakebeam, said part having a rubber insert for substantially lining saidparts for engaging the beam to assist in maintaining the chair properlypositioned.

5. A fourth point brake beam support chair including a part for grippingthe tension member of a brake beam, said part including a rubber insertfor substantially surrounding the tension member to increase thefrictional resistance between the same and the chair.

6. A brake beam support chair including a part for attachment to a brakebeam cylindrical member, said chair part having a recess in its innersurface, and a rubber-like insert in said recess for assisting inresisting slippage between the beam and chair, said insert being ofresilient material and having an integral portion interengaged with saidchair part so as to maintain itself therein at all times.

7. A brake beam support chair having a part for clamping to a brake beammember, said part having recesses on opposite faces, and a rubber insertapplied to one of said recesses for engaging the beam to assist inresisting slippage of the chair, said insert including a retainingportion projecting through said part into the other of said recesses.

8. A brake beam support chair having a part for clamping to a brake beammember, said part having a restricted aperture, and a rubber insertapplied to said part for engaging the beam to assist in resistingslippage of the chair, said insert having an enlarged part which iscompressed for insertion through said recess and then expands so as tosecure said insert in position.

9. A brake beam support chair including a part for attachment to thebeam, said part having a recess, and a rubber insert applied to saidpart for engaging the beam to resist slippage of the chair, said inserthaving a lateral projection with an enlargement at its extremity adaptedto be distorted in insertion through said recess and to overlap saidrecess in the assembled position to maintain said part and insertproperly assembled.

10. A brake beam support chair having a part including jaws for clampingto a brake beam member, an element pivotally connecting said jaws, and africtional insert applied to said part for engaging the beam to assistin resisting slippage of said chair, said insert being secured to saidpivot element.

11. A brake beam support chair having a part for clamping to a brakebeam member, said part having a recess, and a rubber insert secured insaid recess for engaging the beam to assist in resisting slippage of thechair, there being space in said recesspermitting spreadin of saidinsert under pressure.

12. A brake beam third point support chair including means forattachment to structure at the front of the beam, said means including africtionalinsert element for engaging the beam to assist in maintainingthe chair properly positioned.

13. In combination, a brake beam including a strut with third pointsupport ears, a pin between said ears, and-a third point support. chairclamped to said pin, there being a rubber element between said pin andsaid chair for resisting slippage therebetween.

14. A brake beam support chair having opposed resilient frictionelements for gripping opposite sides of a beam part, each of saidelements having suction cups on its beam engaging surface. a

15. A, compressible friction pad for a railway brake beam support chairclamp comprising a clamp-lining portion for engaging a beam member, aprojection on the rear of said portion for extending through the clamp,and a buttonlike head on the end of said projection for retainingthe padin, the clamp.

- 16. A compressible friction pad for a railway brake beam support chairclamp; comprising an elongated clamp-lining portion for engaging a beammember, and relatively restricted means for retaining the pad in theclamp.

EDWIN G. BUSSE.

